Flights to and from Hamburg Airport were suspended on Monday after authorities received a threat to a plane that arrived from Iran, officials said.
The airport said that there had been no takeoffs or landings at the airport in northern Germany since 12.40 pm(1040 GMT), the German news agency dpa reported.
Federal police said they received an emailed threat on Monday morning of an attack on the Tehran-Hamburg flight and were taking it seriously, though they didn't give details.
The plane landed in Hamburg at about 12.20 p.m. The 198 passengers and 16 crew members were undergoing a security check, and the aircraft and luggage on board were being searched.